RAdwords: Loading Google Adwords Data into R

Aims at loading Google Adwords data into R. Adwords is an online
advertising service that enables advertisers to display advertising copy to web
users (see <https://developers.google.com/adwords/> for more information).
Therefore the package implements three main features. First, the package
provides an authentication process for R with the Google Adwords API (see
<https://developers.google.com/adwords/api/> for more information) via OAUTH2.
Second, the package offers an interface to apply the Adwords query language in
R and query the Adwords API with ad-hoc reports. Third, the received data are
transformed into suitable data formats for further data processing and data
analysis.